add test case for #7976

tests/issues/readme.md

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+This directory can be used for adding a test case to a github issue, eg:
+issue `#7976` would have test case named `t7976.nim`
+It makes it easier to find which issue corresponds to a test caes, or vice versa, and removes the guesswork of trying to figure out an appropriate directory/filename by being more systematic.

tests/issues/t7976.nim

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+when defined(case1):
+  import strformat, typetraits
+  type Person = tuple[name: string, age: int]
+  let
+    person1: Person = ("Peter", 30)
+    person2 = (name: "Peter", age: 30)
+  echo fmt"Tuple person1 of type {$person1.type} = {person1}"
+  echo fmt"Tuple person2 of type {$person2.type} = {person2}"
+
+when defined(case2):
+  import strformat, typetraits
+  type Person = tuple[name: string, age: int]
+  let
+    person1 = (name: "Peter", age: 30)
+    person2: Person = ("Peter", 30)
+  echo fmt"Tuple person1 of type {$person1.type} = {person1}"
+  echo fmt"Tuple person2 of type {$person2.type} = {person2}"
+
+when defined(case3):
+  import strformat, typetraits
+  type Person = tuple[name: string, age: int]
+  let
+    person1: Person = ("Peter", 30)
+    person2 = (name: "Peter", age: 30)
+  echo fmt"Tuple person1 of type {$person1.type} = {person1}"
+  echo fmt"Tuple person2 of type {$person2.type} = {person2}"
+
+when defined(case4):
+  import strformat, typetraits
+  type Person = tuple[name: string, age: int]
+  let
+    person1: Person = ("Peter", 30)
+    person2 = (name: "Peter", age: 30)
+  echo fmt"Tuple person1 of type {$person2.type} = {person2}" # simply moved up
+  echo fmt"Tuple person2 of type {$person1.type} = {person1}"
+
+when defined(case5):
+  import strformat, typetraits
+  type Person = tuple[name: string, age: int]
+  let
+    person1: Person = ("Peter", 30)
+    person2 = (name: "Peter", age: 30)
+  echo fmt"Tuple person1 of type {name(person1.type)} = {person1}"
+  echo fmt"Tuple person2 of type {name(person2.type)} = {person2}"
+
+when not defined(case_any_testcase): # main driver
+  # import os, strutils, osproc, nre, strformat
+  import os, strutils, osproc, strformat
+  proc assertEquals[T](lhs: T, rhs: T) =
+    if lhs!=rhs:
+      echo "lhs:{\n", lhs, "}\nrhs:{", rhs, "}"
+      echo "lhs:\n", lhs, "\nrhs:", rhs
+      doAssert false
+
+  var output = ""
+  proc main() =
+    const nim = getCurrentCompilerExe()
+    const self = currentSourcePath
+    let cases = "case1 case2 case3 case4 case5".split
+    for opt in cases:
+      let cmd = fmt"{nim} c -r --colors:off --hints:off -d:case_any_testcase -d:{opt} {self}"
+      output.add "test case: " & opt & "\n"
+      let ret = execCmdEx(cmd, {poStdErrToStdOut, poEvalCommand})
+      doAssert ret.exitCode == 0
+      output.add ret.output
+    let expected = """
+test case: case1
+Tuple person1 of type Person = (name: "Peter", age: 30)
+Tuple person2 of type tuple[name: string, age: int] = (name: "Peter", age: 30)
+test case: case2
+Tuple person1 of type tuple[name: string, age: int] = (name: "Peter", age: 30)
+Tuple person2 of type Person = (name: "Peter", age: 30)
+test case: case3
+Tuple person1 of type Person = (name: "Peter", age: 30)
+Tuple person2 of type tuple[name: string, age: int] = (name: "Peter", age: 30)
+test case: case4
+Tuple person1 of type tuple[name: string, age: int] = (name: "Peter", age: 30)
+Tuple person2 of type Person = (name: "Peter", age: 30)
+test case: case5
+Tuple person1 of type Person = (name: "Peter", age: 30)
+Tuple person2 of type tuple[name: string, age: int] = (name: "Peter", age: 30)
+"""
+    assertEquals(output, expected)
+  main()